Mayor
Middle English: from Old French maire, from the Latin adjective major ‘greater’, used as a noun in late Latin.
wiktionary
Circa 1300; from Middle English maire, from Old French maire(“head of a city or town government”) (13th century), from Latin maior(“bigger, greater, superior”), comparative of magnus(“big, great”). Doublet of major.
etymonline
mayor (n.)
"principal officer of a municipality, chief magistrate of a city or borough," c. 1300, mair, meir (mid-13c. as a surname), from Old French maire "head of a city or town government" (13c.), originally "greater, superior" (adj.), from Latin maior, major, comparative of magnus "great, large, big" (of size), "abundant" (of quantity), "great, considerable" (of value), "strong, powerful" (of force); of persons, "elder, aged," also, figuratively, "great, mighty, grand, important," from PIE *mag-no-, from root *meg- "great."
Mayoress is attested from late 15c. as "the wife of a mayor;" by 1863 as "woman holding the office of mayor."
